Key sentences: 1.I'd like to invite you to Ann's birthday party.2.We hope that all her friends and classmates will come together and have fun on this specialday. 3. The party will be at the school meeting room,next Saturday, November 21st.

1.I'd like to..是委婉的表达想法的用语，eg: I'd like to visit your school next week. I'd like to tell you a story. 2.at作为一个地点介词用，后面跟一个范围不大的地方名词或表示场合的词, eg: I saw Jiamin at the swimming pool. See you atthe party. 3.现在进行时可以表示已经安排好并且将来一定会发生的事情。 eg: I'm working tonight. She's flying home tomorrow.